There's no light on --They ___be at home.A.can't B.mustn't C.neeedn't D.shouldn't

There's no light on --They ___be at home.A.can't B.mustn't C.neeedn't D.shouldn't
There's no light on --They ___be at home.A.can't B.mustn't C.neeedn't D.shouldn't

There's no light on --They ___be at home.A.can't B.mustn't C.neeedn't D.shouldn't
一定是A
can't 不可能

是的

D. shouldn't
100% CORRECT

A is right

A

A正确。
Can't 是不可能。
B ，可能，如果语气较强可也用must,但是表示否定的时候不能用mustn't.
C 是不需要，没必要的意思。
D 是不应该。

A

can't 和mustn't是不能的意思。
needn't是不需要
应该选 D

分析一下：
翻译：这里灯没亮着，他们————在家。
当然是肯定没在家了。
can't be 表示推测， 不可能的意思。
再次考查的是情态动词的用法。
can't be 不可能
must be 肯定是
AAAAAAA

选A。
can't专门用来表示否定猜测。其他的都不行。
must只能表示肯定猜测。